package com.sky.service.impl;

import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.service.WorkspaceService;
import com.sky.vo.*;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.InputStream;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService
{


    @Autowired
    private OrderMapper orderMapper;

    @Autowired
    private UserMapper userMapper;

    @Autowired
    private WorkspaceService workspaceService;


    /**
     * 统计指定时间区域内的营业额数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public TurnoverReportVO getTurnoverStatistics(LocalDate begin, LocalDate end)
    {
        //存放begin-end 之间每天的日期
        List<LocalDate> dateList = new ArrayList();

        dateList.add(begin);
        while( !begin.equals(end) )
        {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        List<Double> turnoverList = new ArrayList();

        for (LocalDate date : dateList) {
            //查询date日期对应的并且订单状态为已完成的订单金额合计
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);

            //select sum(amount) from orders where order_time > beginTime and order_time < endTime and orders_status = 5
            Map map = new HashMap();
            map.put("begin",beginTime);
            map.put("end",endTime);
            map.put("status", Orders.COMPLETED);

            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }


        TurnoverReportVO turnoverReportVO = TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();

        return turnoverReportVO;
    }


    /**
     * 统计指定时间区域内的用户数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end)
    {
        //存放begin-end之间每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while( !begin.equals(end) )
        {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天新增用户量
        List<Integer> newUserList = new ArrayList<>();
        //存放每天总的用户量
        List<Integer> totalUserList = new ArrayList<>();

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date,LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);
            
            Map map = new HashMap<>();
            map.put("end",endTime);
            //每日总用户量
            Integer totallUser = userMapper.countByMap(map);

            //每日新增用户量
            map.put("begin", beginTime);
            Integer newUser = userMapper.countByMap(map);


            newUserList.add(newUser);
            totalUserList.add(totallUser);
        }

        //将结果封装到UserReportVO
        UserReportVO userReportVO = UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ','))
                .newUserList(StringUtils.join(newUserList, ','))
                .totalUserList(StringUtils.join(totalUserList, ','))
                .build();

        return userReportVO;
    }


    /**
     * 统计指定时间区域内的订单数据
     * @param begin
     * @param end
     * @return
     */
    @Override
    public OrderReportVO ordersStatistics(LocalDate begin, LocalDate end)
    {
        //存放begin-end之间每天的日期
        List<LocalDate> dateList = new ArrayList<>();

        dateList.add(begin);
        while( !begin.equals(end) )
        {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }

        //存放每天的订单总数
        List<Integer> orderCountList = new ArrayList<>();
        //存放每天的有效订单数
        List<Integer> validorderCountList = new ArrayList<>();

        //遍历dateList,查询每天的订单总数和有效订单数
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date,LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date,LocalTime.MAX);
            //查询每天的订单总数
            Integer orderCount = getOrderCount(beginTime, endTime, null);

            //查询每天的有效订单数
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validorderCountList.add(validOrderCount);

        }

        //计算时间区间内的订单总数
        Integer totalorderCount = orderCountList.stream().reduce(Integer::sum).get();

        //计算时间区间内的有效订单数
        Integer validorderCount = validorderCountList.stream().reduce(Integer::sum).get();

        //计算订单完成率
        Double orderCompletionRate = 0.0;
        if(totalorderCount != 0)
        {
            orderCompletionRate = validorderCount.doubleValue() / totalorderCount;
        }


        //将结果封装到OrderReportVO中
        OrderReportVO orderReportVO = OrderReportVO.builder()
                .dateList(StringUtils.join(dateList))
                .validOrderCountList(StringUtils.join(validorderCountList))
                .orderCountList(StringUtils.join(orderCountList))
                .validOrderCount(validorderCount)
                .totalOrderCount(totalorderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();


        return orderReportVO;
    }
    /**
     * 根据条件统计订单数据
     * @param begin
     * @param end
     * @param status
     * @return
     */
    public Integer getOrderCount(LocalDateTime begin, LocalDateTime end, Integer status)
    {
        Map map = new HashMap();
        map.put("begin",begin);
        map.put("end",end);
        map.put("status", status);

        return orderMapper.countByMap(map);
    }


    /**
     * 统计指定时间区域内的销量排名top10
     * @param begin
     * @param end
     * @return
     */
    @Override
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end)
    {
        LocalDateTime beginTIme = LocalDateTime.of(begin,LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end,LocalTime.MAX);

        List<GoodsSalesDTO> salesTop10 = orderMapper.getSalesTop10(beginTIme, endTime);

        //获取salesTop10中的name并将其拼接为字符集合
        List<String> names = salesTop10.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList());
        String nameList = StringUtils.join(names, ',');
        //获取salesTop10中的numbers并将其拼接为字符集合
        List<Integer> numbers = salesTop10.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList());
        String numberList = StringUtils.join(numbers, ',');

        //封装SalesTop10ReportVO
        SalesTop10ReportVO salesTop10ReportVO = new SalesTop10ReportVO();
        salesTop10ReportVO.setNameList(nameList);
        salesTop10ReportVO.setNumberList(numberList);

        return salesTop10ReportVO;
    }


    /**
     * 导出运营数据报表
     * @param response
     */
    @Override
    public void exportBusinessData(HttpServletResponse response)
    {
        //1、查询数据库，获取营业数据--查询最近30天的运营数据
        LocalDate dateBegin = LocalDate.now().minusDays(30);//plusDays(-30)也可以！
        LocalDate dateEnd = LocalDate.now().minusDays(1);

        //查询概览数据
        BusinessDataVO businessDataVO = workspaceService.getBusinessData(LocalDateTime.of(dateBegin, LocalTime.MIN), LocalDateTime.of(dateEnd, LocalTime.MAX));

        //2、通过POI将数据写入到excel文件中
        InputStream in = this.getClass().getClassLoader().getResourceAsStream("template/运营数据报表模板.xlsx");
        //基于模板数据创建一个新的Excel文件
        try {
            XSSFWorkbook excel = new XSSFWorkbook(in);
            //获取sheet页
            XSSFSheet sheet = excel.getSheet("Sheet1");
            //填充概览数据
            // --时间
            sheet.getRow(1).getCell(1).setCellValue("时间：" + dateBegin + "至" + dateEnd);

            //获取的第四行
            XSSFRow row = sheet.getRow(3);
            row.getCell(2).setCellValue(businessDataVO.getTurnover());
            row.getCell(4).setCellValue(businessDataVO.getOrderCompletionRate());
            row.getCell(6).setCellValue(businessDataVO.getNewUsers());

            //获取的第五行
            row = sheet.getRow(4);
            row.getCell(2).setCellValue(businessDataVO.getValidOrderCount());
            row.getCell(4).setCellValue(businessDataVO.getUnitPrice());




            //填充明细数据
            for(int i = 0; i < 30; ++i)
            {
                //查询某一天的营业数据
                LocalDate date = dateBegin.plusDays(i);
                BusinessDataVO businessData = workspaceService.getBusinessData(LocalDateTime.of(date, LocalTime.MIN), LocalDateTime.of(date, LocalTime.MAX));

                //获取某一行
                row = sheet.getRow(7 + i);
                row.getCell(1).setCellValue(date.toString());
                row.getCell(2).setCellValue(businessData.getTurnover());
                row.getCell(3).setCellValue(businessData.getValidOrderCount());
                row.getCell(4).setCellValue(businessData.getOrderCompletionRate());
                row.getCell(5).setCellValue(businessData.getUnitPrice());
                row.getCell(6).setCellValue(businessData.getNewUsers());

            }


            //3、通过输出流将excel文件下载到客户端浏览器中
            ServletOutputStream outputStream = response.getOutputStream();
            excel.write(outputStream);

            //关闭资源
            excel.close();
            outputStream.close();

        } catch (IOException e) {
            e.printStackTrace();
        }


    }
}
